How many calories per day for a 14-year-old girl or boy?

It varies a little based on weight, height, activity level, and a few other factors, but on average about 1,400 to 1,600 calories a day.

Answer

Take a look at the new MyPyramid.gov site. The USDA is finally reflecting some pretty good nutritional guidance. It lets you customize a food plan based on your activity level. Unless you're spending quite a bit of time in vigorous of strenuous activity, you'll probably need about 2300-2500 (good quality, nutrient packed) calories per day.

Answer

According to the national health organisation and average 14 year old boy needs 2800 calories a day when doing lots of activity, 2500 if not very active, and around 1800-2100 calories if not doing any activity.

Answer

Calorie intake depends on a variety of answers. If the boy is very active he should consume anywhere from 2500-2800, moderately active should consume 2100-2400 and if little or no activity anywhere from 1700-2000. Then again, if the boy's mass includes more lean muscle mass than fat mass then the calorie intake should be higher due to muscle demands.

AnswerAlso something to remember in order to lose weight, if that is your goal, eat about 500 calories less than these numbers per day, or do burn 500 more calories per day with cardiovascular exercises. You should be able to lose about one pound a week if you do that, I recently lost 30 pounds, but I didn't do any cardio exercises, just stopped eating saturated fats and also dropped a lot of carbs and extra calories from my diet.